On Mon, 21 Oct 2013 10:24:41 +1100 Andrew Cunningham <[email protected]> wrote:
> I suspect it is a font issue, rather than a renderer issue, but then > using a dotted circle is a convention used in the unicode charts and > in the unicode spec. The extra dotted circles are a layout engine issue at least in part. On Windows, one can choose whether Firefox uses Uniscribe or HarfBuzz. I don't know the granularity of the choice, but it seems to be on a script by script basis. If I choose HarfBuzz for all scripts, the unwanted dotted circles vanish. However, I'm not sure how much Uniscribe is actually to blame. If the default grapheme cluster <U+25CC, U+0E31> is being split between script runs, the fault will arguably lie with whatever does the splitting. A string starting U+0E31 will start to the left of the origin of the string unless something is inserted before it, albeit a space. > It is not a combination I'd expect a font > developer from SE Asia to necessarily support. > Since publications in SE Asia have their own typographic conventions > for displaying isolated combining marks. The usual Thai convention of using a dash as the place holder also suffers from layout engines inserting dotted circles. Richard.
